Could you please provide more information about what you mean with Maildir format? I am not so familiar.
Is it a quick and stable solution?

Best Regards,

Nikos

Quoting Timo Sirainen <t...@iki.fi>:

On 25.9.2013, at 10.27, Nikos Papadopoulos <n...@ecs.gr> wrote:

We have a mail server (RHEL 6.0, Postfix and Dovecot 1.0.7).

mail_location: mbox:~/mail:INBOX=/var/mail/%u

There is great delay in the delivery of the emails. Some seem to not be
delivered at all. Issuing the mailq command we get the following message for
almost all the email accounts:

(cannot update mailbox /var/mail/xyz for user xyz. unable to lock for
exclusive access: Resource temporarily unavailable)

mbox format is problematic in this way. Newer Dovecot versions (v2.x) do some extra work to unlock the mbox earlier with POP3. That might help you. Or you could switch to Maildir format where this isn't a problem. I'm not sure why it started happening only now and not earlier. Perhaps the POP3 clients are downloading mails more slowly, perhaps you're getting more mail and things are running slower than before.




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